After using
47 of her flour, Mrs Neo bought another 20 kg of flour. As a result, Mrs Neo now has
87 as much flour as what she had at first. How many kilograms of flour did Mrs Neo have at first?
| |
Flour |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
3 u |
|
| Change 2 |
+ 20 |
|
| After 2 |
3 u + 20 |
8 u |
Fraction of flour left after using
47 of it
= 1 -
47 =
37 Amount of flour left after using some = 3 u
Amount of flour after buying 20 kg of flour = 3 u + 20
3 u + 20 = 8 u
8 u - 3 u = 20
5 u = 20
1 u = 20 ÷ 5 = 4
Amount of flour that Mrs Neo had at first
= 7 u
= 7 x 4
= 28 kg
Answer(s): 28 kg
